The RealPlayer install process

1. Download the RealPlayer11GOLD from http://www.real.com/linux to your home directory.

2. Open Terminal (from this point on, you must have admin rights).

3. Type sudo chmod +x RealPlayer11GOLD.bin

4. Type sudo "./RealPlayer11GOLD.bin"

5. Follow prompts. It'll start the installer. Do as it instructs and hit Enter.
6. It'll ask for the install path. Default is fine and hit enter.
7. It'll ask for a confirmation of install path. Press F to Finish the install.
8. It copies files, installs icons, etc. When you get the prompt, it's done.

Congrats! You have just installed RealPlayer 11 on Ubuntu.
To launch the app, go to Applications > Sound & Video > RealPlayer 11.